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package bjc.funcdata.bst;
import java.util.Comparator;
import java.util.function.BiFunction;
import java.util.function.Function;
import java.util.function.Predicate;
/**
* A interface for the fundamental things that want to be part of a tree.
*
* @author ben
*
* @param <T>
* The data contained in this part of the tree.
*/
public interface TreePart<T> {
/**
* Add a element below this tree part somewhere.
*
* @param element
* The element to add below this tree part
*
* @param comparator
* The thing to use for comparing values to find where to
* insert the tree part.
*/
public void add(T element, Comparator<T> comparator);
/**
* Collapses this tree part into a single value.
*
* Does not change the underlying tree.
*
* @param <E>
* The type of the final collapsed value
*
* @param nodeCollapser
* The function to use to transform data into mapped
* form.
*
* @param branchCollapser
* The function to use to collapse data in mapped form
* into a single value.
*
* @return A single value from collapsing the tree.
*/
public <E> E collapse(Function<T, E> nodeCollapser,
BiFunction<E, E, E> branchCollapser);
/**
* Check if this tre part or below it contains the specified data item.
*
* @param element
* The data item to look for.
*
* @param comparator
* The comparator to use to search for the data item.
*
* @return Whether or not the given item is contained in this tree part or its
* children.
*/
public boolean contains(T element, Comparator<T> comparator);
/**
* Get the data associated with this tree part.
*
* @return The data associated with this tree part.
*/
public T data();
/**
* Remove the given node from this tree part and any of its children.
*
* @param element
* The data item to remove.
*
* @param comparator
* The comparator to use to search for the data item.
*/
public void delete(T element, Comparator<T> comparator);
/**
* Execute a directed walk through the tree.
*
* @param walker
* The function to use to direct the walk through the tree.
*
* @return Whether the directed walk finished successfully.
*/
public boolean directedWalk(DirectedWalkFunction<T> walker);
/**
* Execute a provided function for each element of tree it succesfully completes
* for.
*
* @param linearizationMethod
* The way to linearize the tree for executing.
*
* @param predicate
* The predicate to apply to each element, where it
* returning false terminates traversal early.
*
* @return Whether the traversal finished succesfully.
*/
public boolean forEach(TreeLinearizationMethod linearizationMethod,
Predicate<T> predicate);
}
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